I think there are wireless pcmcia drivers for b cards.
For g and n cards you'll strike out, also if they are on usb.
For one thing the pcmcia cards will look for hardware in the pcmcia memory space, strike one.
Strike two is that cards have different ways to set the security settings WEP/WPA/WPA2 etc. So unless you'll do an open wifi network....
I'm sure there are enough problems for you to strike out on this...
What I suggest is that you either set up a bounty, or learn to code a wifi stack for the amiga :-)
One that'll allow for devices to either be accessed through poseidon, zorro or pcmcia. You'll be a hero. :-)